Boring-machine



' (No Model.) F KABE BDRING MACHINE. No. 269,583. Patented Dec. 26,1882.

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- UNITEDl` STATES PATENT ;OEEICE.

FRITZ KADE, OF SANDUSKQOHIO.

BORING-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 269,533, dated December26, 1882.

l Application filed May 24, 1882. (No model.)

To allichom it may concerny l Be it known that I, FRlTZ KADE,ofSandusky, in the county of Erie and State of Ohio, have invented newand useful Improvements in Portable Boring-Bars; and I do hereby declarethat the following is a full, clear, and exact description thereof,reference being had to the accompanying drawings, which form apart ofthis specification.

The nature of this invention relates to certain new and usefulimprovements in that class of boring-machines wherein the cutter-barrevolves, and also slides with an endwise motion,

the work being at rest.

The object of my invention is to constructa very compact, simple, andhandy tool, especially adapted to cut or recut tapering holes forwrist-pinsin cranks, pitman-rods, 85o., without removing` the work fromits position and leaving it to the skilled workman to secure the tool tothe work by any kind ot' temporary sup. port or clamps, as thecircumstances will suggest, all as more fully hereinafter described.

Figure 1 is a vertical central section ot' my improved tool. Fig.2 isa-perspectivevview of the head-stock with the adj ustahle cutter-barbearing. Fig. 3 is a similar view, but from the `opposite or inner side.,Fig et is a. vertical cross-section of the parts shown in Figs. 2 and3. Fig. 5 is a perspective view of the ball bearing head-stock. Fig. 6is a perspective view ot' the cutter-head. Fig. 7 is a perspecvbearingC, and the opening within which it rests is oblong in cross-section a-ndadmits of adjusting the box either centrally or eccentrically to thebearing C, four set-screws, cc d d, being used to hold the box in itsadjusted position. The set-screws d d are attached to sliding plates e,with their lower ends engaging in corresponding recesses upon the sidesof the box I), so that however the latter is shifted in its position theset-screws d d can be made to bear centrally against its sides. The boxD has a central bore, g, of proper size to allow the cutter-bar A tofreely slide through it, the spliuefengaging with the groove in thecutting-bar. The box D terminates upon the inner side in the feed-cam E,upon the face of which the feed-pawl F is forced to travel.

' Gr is thefeed-nut, and its hub is provided with a female screwengaging with the feed-screw of the cutter-bar, while its cogs engagewith the pawl F whenever the latter drops into the cut-away portion h ofthe cam E.

H is a cutter-head, to which the cutting-bit I is secured in the usualmanner. This cutter head is threaded upon the cutter-bar, and can besecured upon the same in any desired position by means of theset-screwz'.

J is a head-stock supporting the other end of the cutting-bar. It formsa bearing for the ball-box K, throughwhich the cutter-bar is al lowed toslide freely.

In practice, the parts being constructed as described, the cutter-bar ispassed through the hole upon which the work isto be done; then the4head-stocks are secured in temporary supports, which are clamped orbolted to the work. In Fig. 7 is shown a very simple support, L, for thehead-stocks, which will be found service- `able for most klnds of work,the set-screws l;

allowing the head-stock to be nicely adjusted, while the bolts l willsecurely clamp the device to the work. Now, if the box D is adjustedeccentrically within the bearing C, the latter, on being rotated, willimparta conical motion to the cutter-bar, the apex of the cone beinglocated in the center of the ballbox K, and if the cutter is adjusted toperform the work it will cut a tapering hole, the cutter-bar A beingpushed laterally at every revolution of the bearing C by nleans of thefeed-nut G, cam E, and pawl F, which act in a well-knowu manner. Noparticular devices for rotating the bearing C are shown in the drawings;but in most instances it ,will be found convenient to secure agear-wheel upon the part m of the bearing C and rotate it by means of acrank and pinion. The operator ot' course can in every instance make thetool cut any taper heV wishes by properly adjusting the two factorswhich regulate it-viz., the distance between ICO the head-blocks andeccentricity of the box I). It' the latter is secured in the axialcenter of the bearing U, the tool Will bore a hole with parallel sides.In adjusting the head-blocks upon the work care should be taken to maketheir axial centers coincide with the cen'tex` of the bore to be cut orrecnt.

The invention isdesigned as an improvement upon the device set Forth inPatent No.105,265, ot' 1870, as specifically pointed out in the claims.

It will he understood that the box I) `is adjustable in the bearing C togive the desired angle to the cutter-bar. Motion being given to saidcutter-bar, and the pawl F being engaged with the nnt G to hold itstationary, it follows that the cutter-bar will have longitudinalmovement until the said pawl F is forced out of such engagemenhby thecam E, which action stops the feed.

What I claim as my invention is- 1. In a tool for cutting taper holes, acutterbar having a feedscrew and a longitudinal groove, a leed-nut, apaw] engaging with said nut to hold it still, and thus cause thecutterbar to have a longitudinal movement, and a cam for releasing saidpawl, combined with an eccentrically-adjustable bearing having inter nalspline, and a head-stoel; with a circular interior bearing, as and forthe purpose set forth.

2. In a tool for cutting taper holes, the combination ofthe head-stockB, circular bearing C, provided with devices for rotating it,eccentrically-adjustable bearing` D, stationary setscrews c, andlaterally-adjustable plate Vor nut e and set-screw d, all combinedsubstantially as described.

3. In a tool for cutting` taper holes, the combination of the cutter-barA, having feed-screw a and groove b, with cutter-head H, feed-nut G,pawl F, and cam E, and with the box D, having` spline f, as and for thepurposes set forth.

In testimony that I claim the above as my invention I have hereuntoaffixed my signa 45 ture this 27th day ot' March, 1882.

FRITZ KABE.

XYitnesses:

II. S. SPRAGUE, H. STANLEY.

